Bag and method of making same



May 14, 1935. R, N. CUNDALL ET Al.

BAG AND METHOD 0F MAKING SAME Filed Jan. 1o, 1951 Patented May i4, 1935PATENT OFFICE l amm l BAG AND mamon or mama sans neben N. cansan,Hamburg, ma william n. Powell,L Buifalo, N. Y., assignors, by mane al-'signmentia to Bamm-Inc., a corporation of Delaware Application January1o, massaal No.- 507,874

This invention relates to a bag and .method of sealing the same and more`particularly tomultiple walled bag adapted to contain poweredmaterials, such as flour, sugar, lime, plaster, gypsum,

fertilizers and the like, in which it is not only necessary to close thebag in such manner that the fastenings at the mouth oi the bag will notbreak or loosen but also to provide a seal which prevents the leakage orsifting out of the contents when the bags are handled either when thebags are inverted or when they are set down and the material tends toblow out through the impact of setting the bag down.

In the development of open mouth paper bags for use as larger sizedpackages of powdered materials it has been found desirable to make themwiththe walls of a number of thicknesses of paper. As there is a limitto the strength which can be obtained from a single thickness of paperthe most effective way to provide the necessary. strength for large bagshas been found to provide a bag having a number of walls or in effect asingle bag' made of a number of bags set one within the other. This notonly provides the requisite strength but also permits of employing amoisture-resistant bag or wall as the outer wall which can be thin andinexpensive and not only protects the con-- This speciiiciion is-acompanion to the appli 40 cations of Robert N. Cundall, Serial No.507,615, illed January 9, 1931, and Serial No. 507,616, illed January 9,1931.

One of the principal objects of `this invention is to provide a bag forfinely powdered or dusty materials in which the mouth of the bag isclosed in such manner as to provide a strong, durable and permanentclosure and seal which is also sift- Vprooi and 4entirely prevents thefine, dusty materials from sifting out through the closure.

Another purpose is to provide a bag which when closed is as strong atthe mouth or place of sealing as any other portion o! thebag.

Another aim is to provide a bag of this character terial falling intothe contents oi' the bag.

' facture.

in which there is no danger of the sealing ma.

A-further object is to provide such a bag land process which permits ofthe sealing of the bag to be provided by automatic processes and avoidall hand operations.v

'A still further aim is to provide a bag which is lneat in appearanceand can be provided with a Atransporting goods which are relativelyvaluable and subject to pilfering.

In the accompanying drawing:

Fig. 1 is a fragmentary perspective view of a bag made in accordancewith our invention.

Fig. 2 is a fragmentary end elevation thereof. Fig. 3 is a fragmentaryvertical section .through the form of bag shown in Fig. 1.

Fig. 4 is a fragmentary top plan view of the form of the invention shownin Fig. 1 showing the same preparatory to sealing.

Fig. 5 is a fragmentary vertical section through a modified form oi' theinvention. l

Fig. 6 is a fragmentary perspective view of a still further modifiedform of the invention.

Fig. '7 is a vertical section through the modied form of the inventionshown in Fig. 6.

Fig. 8 is a vertical section showing another modification of the presentinvention.

Fig. 9 is .a perspective view showing a still further modincation of thepresent invention.

Fig. 10 is a vertical section through the form of the invention shown inFig. 9.

In the present application the invention isshownasembodiedinabagwhichisalready formed, i. e. in closing and sealingthe mouth of.

a fabricated bag, but it will also be apparent that the invention can beembodied in closing and sealingthebottomsofbagsduringtheirmanu-Oneofthemcsteifectivewaysofclosinga multiple walled bag' containingdusty materials is by stitching the sides of the mouth of the bagtogether with cotton thread. Stitching through the sides of the mouth ofthe bag, however, has the effect of weakening the bag and dustymaterialswillleakthroughthetopofthebagbetween the stitches.' in .thestitching of the.`

bagthestitchingneedlemofeoursalargerthan the cottonthreadusedinstitchingand therefore the needle punches a larger hole through the,wa'llsofthebagthantheihreadllsandthese large holes permit the dustymaterial to escape through the `holes in the bag around the thread. Themost effective way that has been found to vmake va. bag tight or sealedat the opening is by some form of gluing. Inasmuch, however, as theprincipal object of employing a. multiple walled bag is to obtain therequired strength it is obvious that incases where great 'strength isneeded unless some methodof reinforcing this seal is obtained, it willnot be as strong as the walls of the bag. The present inventiontherefore proposes to combine stitching and gluing in such manner thatthe stitching provides a closure of the necessary strength and thegluing not only seals the bag at the closure but also strengthens thestitching. While the invention proposes the use of stitching and gluingit will be apparent that in place of the stitching another form offastening which extends through the walls of the bag could be employed,such as staples, and that while glue is preferable any adhesive orplastic hardening material can be employed, preferably one that is quiteliquid at the` time of application and will harden to a stiff gummycondition. such a. condition being preferable to a glue which becomesbrittle.

'Ihe invention is shown as embodied in a multiple walled bag having aninner wall Ill and an outer wall II, such a. multiple walled bag beingin effect one bag within the other, although the invention can' beembodied in a bag having any number of walls. Such a multiple walled bagis made in any suitable manner to provide a mouth I2 at its upper endwhich when furnished to the packer can be opened up and the materialsdeposited in' the bag.

In the form of the invention shown in Figs. 1-4, when the bag isfurnished to the packer one of the sides of the outer wall II of the bagis extended upwardly to form a flap I3, this ilap being substantiallyequal in length to half the circumference of the vmouth of the bag andextending from one end of the mouth to the other. The bag so furnishedalso has aslit M provided at each end of the mouth I2 in the outer shellor wall II and extending downwardly from the mouth of the bag.' y

The bag is furnished to the packer in a collapsed or flattenedcondition, the packer opens up the mouth of the bag and deposits thedusty or powdered materials through the mouth I2 into the bag. He thenruns the mouth of the filled bag through a sewing machine and closes themouth of the bag by a row of stitches I5. In so lopposite end sothatwhen the bag is sewed in this manner a secure and tight closure isprovided for the mouth of the bag.

-In the absence of provision to prevent it, however, the dusty orpowdered materials contained in the bag would leak out through the mouthof the bag past the stitching I5. Also since `the needle of the sewingmachine must necessarily be larger than the thread I5 the holes I3formed by the needle are of greater size than the thread I5 and someleakage is liable to occur through these holes I6, particularly when thebag is set down with some force. To prevent this the present inventionproposes a seal of glue or some other.

hardening plastic adhesive. "With the form of-the plied to the whole ofthe inner face of the flap or wing I3 extending down to the bottom ofthe slit I4. This glue can be applied automatically by means of rollersor brushes or in any other suitable manner. After this glue is appliedthe flap I3 is bent around the upper end of the mouth of the bag anddown on the opposite side so that its glued -face engages the upper endormouth of the bag and also the opposite side, as best shown in Fig. 3.After being so bent the mouth of the bag and the iiap I3 is passedbetween rollers so that the flap I3 is securely glued in position and atthe same time a part of the glue II is forced into the holes I8 therebyfilling out the excessof these holes and preventing the powderedmaterials from entering the same. It will be observed that in this formof the invention not only does the glue I'I completely seal the mouth ofthe bag and the oversize holes I8 caused. by the sewing machine needlein stitching but it also strengthens vthe stitches I6. In order thatthese stitches tear loose it is necessary thatl they be pulled throughthe walls of the bag and by embedding these stitches in glue and alsocausing them to adhere to the flap I3 such pulling through of thestitches is entirely prevented in any normal handling of the bags.

In the form of the invention shown in Fig. 5, the outer shell or wall IIof the bag is extended upwardly on both sides of the mouth I2 and thisouter shell or wall II is slit at the ends of its mouth in the samemanner as the slit I4 in the form of the invention shown iii-Figs l-4.This provides in eiect two opposing flaps 2| and 22 Which extendupwardly from opposite sides of the bag. In sewing the bag these flaps2I and 22 are bent downwardly into a horizontal position and thestitching I5 is started atone end of the mouth of the bag and passesthrough the opposite walls of the inner shell I0 and intermediate shellI0-a. Al layer of glue 23 is then applied to the inner or upper faces ofthe flaps 2I and 22. The flap 22 is then bent over 'the mouth of the bagand then' downwardly so that its glued face engages the mouth of the bagand also the opposite outer side of the intermediate wall or shellIll-a. This flap 22 is then rolled or pressed so that its glue forms afirm bond with the mouth of the bag and also a part of this glue isforced into the oversized holes I8 formed during the sewing operationthereby plugging these holes and preventing the Aescape or loss of anydusty material therethrough. Thereafter the other nap 2| is bent aroundthe outer face of the flap 2 2 and is rolled down so that its glue I6forms a firm bond with theflap 22. It is therefore apparent that themouth of the bag is securely closed by means of the stitching I5 andthat at the same time this stitching is reinforced and the mouthof theba'g and the stitching sealed against the escape of material by theglued flaps 2| and 22. l

In the form of the invention shown in Figs. 6 and I one side of theouter wall or shell I I is extended upwardly to form a flap I3 as in thepreferred construction shown in Figs. 1-4 but the bag invention shown inFigs. 1-4 this glue I'I is apis .inprovided with the slit I4 at oppositeends of the mouth of the bag. In this form the flap I3 remains in anupstanding position during the sewoperation and the stitching I5lextends through all of the walls of the bag and sews its opposite sidesfirmly together to provide a closure for the mouth of the bag. A layerof-glue I9 is then applied to the crresponding face and upper part ofthe flap I3 and this flap is folded over the mouth of the bag anddownwardly so that its glued face engages the opposite side of the bagand also the exposed part of the stitching I5. This flap I3 isv thenrolled down to secure a good bond between it and the opposite side ofthe bag and also to cause a part of the glue to be forced into theoversize holes I8 formed by the sewing machine needle in stitching. Atthe same' time a layer of glue 20 is applied to the stitching at theopposite side of the bag, this glue eniering the oversize holes I8 fromthat side of the bag and insuring an adequate and perfect seal of theseholes so that the dusty material cannot escape therethrough. t

In the form of the invention shown in Fig. 8, the bag is formed with theap I3 in the'same manner as in the form of the invention shown in Figs.6 and 7. Before sewing the bag, however, a layer of glue 24 is appliedalong one side of the inner wall III. of the bag immediately inside itsmouth I2. sewing machine the sides Aof the bag are rolled down so thatthis layer of glue 24 forms a seal for the mouth of the bag. Thestitching is started at one end of the mouth of the bag and extendsthrough the opposite sides of the bag so that all of its walls are sewntogether. In providing the stitching I the holes I8 formed by the sewingmachine needle are, of course, larger than the thread I5 andconsequently in the absence of provision to prevent lit the dustymaterial would leak out through these holes. To prevent this a layer ofglue 25 is applied to the exposed stitches at one side of the bag andforced into the stitching so that a part 'of the glue enters the holesI8 from that side of the bag and simultaneously another layer of glue 26is applied to the opposite side of the bag at the stitching so that theglue entersthe holes I8 from the opposite side and completes the sealingof the holes. The i'lap I3 is then folded over the mouth of the bag anddown the opposite side thereof and rolled into place so as to form afirm bond with y the layer of glue 25. It is also obvious that the layerof glue could be applied to the flap I3 instead of the body of the bagif desired.

In the form of the invention shown in Figs. 9 and 10, the invention isshown as applied to a gusseted bag. In this form thebag composed of theinner shell or wall I 0 and the outer shell or wall II is provided withan end wall or gusset 21 so that the bag when opened is of rectangularform in a horizontal section.

In this form the mouth ofthe inner wall or shell I0 is brought togetherand folded as indicated at 28 so as to provide an interlock. One sideWall of the outer shell II is extended upwardly to provide a flap I3similar to the flap I3 shown in the form of the invention illustrated inFigs. 6 and 7 and a layer of glue 29 is applied to the inner side ofthis flap I3. This flap I3 is then folded down over the top of the bagand the interlock 28 and down against the opposite side of the bag sothat it covers the bag and forms a s eal which prevents the escape ofany of the powdered or dusty material. In this form of the inventionsewing or stitching is not employed, although it could be if desired.

It will be noted that the invention has been shown' and described asembodied in the sealing When the bag is put through the of a bag alreadyfabricated. It is obvious, however, that the invention can be embodiedin closing the bottom of the bag as well and that' the bag can be closedand sealed at both ends in accordance with the invention and theinvention is therefore tovbe construed as equally applicable to thisuse.

It is apparent from the foregoing. that all of the forms of the presentinvention provide a bag in which the closure is strong and durable andequal to any other portion of the bag; the bag is sealed so as to besift-proof at this closure; there is no danger of bits of glue breakingand falling into the contents of the bag so as to contaminate thecontents; the seal is neat in appearance and the closing and sealing ofthe bag can readily be effected by automatic means. It will also beobserved that the sealing not only seals the closure so as to preventthe filtering out of the dusty materials which the'jbag is designed tocontain but also strengthens the closure.

Each of the forms of the invention seals the bag so as to preventcontamination thereby permitting its use for foodstuffs and alsoprovides a seal which is pilferproof thereby permitting its use forvshipping valuable materials which are particularly subject to pilfering.

While the bag has been shown and described with particular reference toa multiple walled bag it is apparent that some features of the inventioncan be embodied in a single walled bag and the invention therefore alsocomprehends this application.v

We claim as our invention:

1. A bag comprising a multi-walled tubular body made of flexiblematerial and having a mouth at at leastA one end and the outer wall atat least one side ofsaid 'bag being extended to form a flap adapted toembrace the other walls at the mouth of the bag, means for fasteningtogether the opposite sides of said other walls at the mouth of said bagand a hardening plastic material covering all of the exposed parts ofsaid fastening meansand sealing the mouth of said bag and atleast a partof said hardening plastic material securing said flap `over the mouth ofsaid bag. p v v 2. A bag comprising a multi-walled tubular .body made offlexible material, and having a mouth at at least one end and the outerwall at at least one side of said bag and adjacent said mouth beingextended to form a iiap, fastenings extending through opposite sides ofthe inner wall of said bag atA its mouth and forming a closure thereforand a hardening plastic material securing said flap over the mouth ofsaid bag, said hardening plastic material forming a seal for the mouthof said bag and also a seal for the opposite ends of the holes made insaid bag by the penetration of said fastenings.

3. A multiple walled bag comprising a multiple walled tubular body madeof flexible material and having a mouth at at least one end, the outerwall of said bag projecting outwardly beyond said mouth at at least oneside `of said bag, fastenings extending through opposite sides of theinner wall of said bag adjacent its mouth and an adhesive for securingsaid iiap over the mouth of said inner wall', said flap covering theexposed vparts of said fastenings at at least one side of said bag. l

4. A-multiple walled bag comprising amultiple walled tubular body madeof flexible material and having a mouth at at least one end, the outerwall of said bag being slit inwardly from the mouth at diametricallyopposite places and said outer wall between said slits and on at leastone side being extended outwardly to form a flap,l fastenings extendingthrough opposite sides of the mouth oi!` an inner wall and forming aclosure for said mouth, and a hardening plastic material securing saidap over the mouth of said b ag and sealing said closure and also theopenings made in said bag by the penetration of said fastenings.

5. A multiple walled bag, comprising a multiple walled tubular body madeof exible material and having a mouth at at least one side, the outerwall of said bag being slit inwardly from' the mouth at diametricallyopposite places to points below the mouth of said inner wall and saidouter wall between said slits being extended to form two outwardlyprojecting flaps, fastenings extending through the opposite sides of aninner wall to forma closure for the mouth of said inner wall, ahardening plastic material securing-one of said aps over the mouth ofsaid inner wall and forming a seal for said mouth and also for each endof the holes made insaid inner wall by the penetration ofsaidfastenings, and additional hardening plastic material securing theother ap over said first iiap.

6.. The method of closing a multi-walled tubular body having a mouth atat least one end and the outer wall at at least one side of said bodybeing extended to form a flap adapted to embrace the other walls at themouth of the bag which consists in passing fastenings through theopposite sides of said other walls at the mouth of said body andapplying a hardening plastic material to all of the exposed parts of thefastenings of said body and folding said ap over the mouth of said bodyso as to be held in such folded condition by said hardening plasticmaterial.

7. 'I'he method of making a multi-walled lbag comprising at least twotubular bodies made of flexible material and-having a mouth at at leastone end and the wall of the outer tubular body at atleast one side ofsaid bag being extended to form atlap,which consists in passing1fastenings throughopposite sides of the inner body of said bag at itsmouth and forming a closure therefor and applying a hardening plasticmaterial to said fiap and the mouth of the inner body of said bagthereby to secure said ap over said mouth and form a seal for theopenings made in the walls of said bag by the penetration of saidfastenings.

8. 'I'he method of making a bag comprising a multiple walled tubularbody made of flexible material and having a mouth at at least one endand the outer wall of said bag being slit inwardly from the mouth atdiametrically opposite places and said outer wall between said slits andon at least one side being extended outwardly to form a ap, whichconsists in passing fastenings through `opposite sides of -the mouth ofan inner wall to form a closure for said mouth and applying a hardeningplastic material to said flap and securing said ilap over the mouth ofsaid bag, said hardening plastic material sealing said closure and alsothe openings made in said bag by the penetration of said fastenings.

9. The method of making a bag comprising a multiple walled tubular bodymade of flexibleto form two outwardly projecting aps, which consists inpassing fastenings through the opposite sides of an inner Wall, abovesaid slits to form a closure for the mouth of said inner wall, applyinga hardening plastic material to secure one of said'flaps over the mouthof said inner wall and forming a seal for said mouth and also for eachendfof the holes made in said inner wall by the penetration of saidfastenings and additional hardening plastic -material securing'the otherflap over said iirst flap.

10. A bag comprising a multi-walled tubular body made of flexiblematerial and having a mouth at at least one end, the outer wall of oneside of said bag being extended to form a iiap projecting outwardlybeyond said mouth and adapted to embrace the other walls at the mouth ofthe bag, stitching extending through the said other walls of said bagand closingsaid mouthv and an adhesive securing said flap over saidmouth and the stitching at atleast one side of said bag.

11. A bag comprising a multi-walled tubular body made of flexiblematerial and having a mouth at at least one end, the outer wall of saidbag being extended to form a ap projecting outwardly beyond said mouth,stitching uniting the sides of the inner wall of said bag to close itsmouth and an adhesive securing said ap over said mouth and securing saidflap tothe opposite side of the bag.

12. A multiple walled bag comprising a multi-v ple walled tubular bodymade of flexible material and having a mouth at at least one end, theouter Wallof -said bag being slit inwardly from the mouth atdiametrically opposite places and said outer wall between said slits andon one side being extended outwardly to form a ap, fastenings extendingthrough opposite sidesof the' mouth of an inner wall and also throughthe side of said outer wall. opposite said ap, said fastenenings forminga closure for said mouth, and a hardening plastic material securing saidap over the mouth of` said bag and sealing `said closure and also theopenings made in said bag by the penetration of said fastenings.

13. A bag comprising a tubular body made of flexible material and havinga mouth at at least one endand the wall atl at least one side of saidbag and adjacent said mouth vbeingvextended to r form a. projectingflap, fastenings extending through opposite sides ofthe wall of said bagat said bag by the penetration of said fastenings.

14. 'I'he method of making a bag comprising a tubular body made offlexible material and having a mouth at at least one end and the wall atat least one side of said bag being extended to form a flap whichconsists in passing fastenings through opposite sides of the wall ofsaid bag at its mouth and forming a closure therefor, applying ahardening plastic material to said ap and mouth of said bag thereby tosecure said iiap overthe mouth of said bag and form a seal for saidclosure and for the adjacent ends of the openings made in said bag bythe penetration of said fastenings and applying additional hardeningplastic material to the exposed parts of said fastenings on the oppositeside of said bag thereby to form a seal for the opposite ends of theholes made in said bag by the penetration of said fastenings.

l5. A bag comprising a multi-walled tubular body made fof flexiblematerial and having a mouth at at least one end and the outer wall ofone side of said bag beingI extended to form a flap adapted to embracethe other walls at the mouth of the bag, means for fasteningtogether theopposite sides of the mouth of said bag and a hardening plastic materialcovering all of the exposed parts of said fastening means and sealingthe mouth of said bag and at least a part of said hardening plasticmaterial securing said flap over the mouth of said bag.

16. The method of closing a multi-walled tubular body having a mouth atat least one end and the outer wall of one side of said body being'extended to form a flap which consists in passsuch folded condition bysaid hardening plastic material.

17. A bag comprising a tubular body having side walls made of aninterior ply of flexible material and having a mouth at one end, anexterior reinforcing ply of exible material extended adjacent to andparallel with said4 mouth, stitching extending through said plies andclosing said mouth, a sealing ap folded over the mouth of said bag andembracing the stitching on both sides and an adhesive securing saidsealing flap in place.

18. As an article of manufacture, a bag composed of a tubular body madeof plies of flexible material and having a mouth at one end, and meansfor fastening together opposite side plies of said bag to provide aclosure, said fastening means comprising a line of stitches and anadhesive, at least one side ply of the bag material being formed with afreely extending flap adapt# l ed to be folded over to encloseunderlying ends of the plies of bag material and said fastening means atboth sides andto be secured adhesively thereto.

ROBERT N. CUNDALL. WILLIAM B. POWELL.

